/Engine/Plugins/Importers/AlembicImporter/Source/AlembicLibrary/Public/AbcFile.h
Reads the frame data for the given FrameIndex, with the ReadIndex used to specify the current read when doing concurrent reads (up to 8 at the same time)
void ReadFrame ( int32 FrameIndex, const [EFrameReadFlags](API\Plugins\AlembicLibrary\EFrameReadFlags) InFlags, const int32 ReadIndex )